Measurement knowledge of tool microscope
1. Imaging method: Imaging method is a measurement method that uses the mark of the central Olympus microscope to aim and locate the image method. When measuring, usually use the reticle on the reticle to aim at the edge of the test object image, read the value on the reading Olympus microscope, and then move the worktable to aim at the same reticle. to the other side of the file image and take another reading. The difference between the two readings is the measured value of the DUT.
2. Axosection method: Axiosection method is a measurement method that uses the mark of the central microscope to aim at the axis line of the test piece and uses the engraved line on the measuring knife. The measuring knife is an accessory of Universal Display. There is a scribe line on its surface, and the size from the scribe line to the cutting edge is 0.3 mm and 0.9 mm. When measuring, put the measuring knife on the measuring knife backing plate, and the scribe line passes through the axis of the test piece, and the edge of the measuring knife The mouth is in close contact with the surface to be tested, aim with the corresponding meter-shaped line, measure the distance between the engraved lines of the two measuring knives, and indirectly measure the measured value of the piece under test. In order to avoid the calculation in the measurement, two groups of four symmetrically distributed parallel lines are engraved on both sides of the middle vertical Mizi line. The distances between each set of engraved lines and the central engraved line are 0.9 and 2.7 mm, which is exactly the measuring knife. The distance between the cutting edge and the reticle is 3 times between 0.3 and 0.9 mm. In this way, when aiming with a 3x objective lens, the 0.9 and 2.7 mm engraved lines on the reticle just press the 0.3 and 0.9 mm engraved lines on the measuring knife. aimed at. Mainly used for pitch diameter measurement of threads.
3. Contact method: The contact method is to use the mark pair of the central microscope and the universal display attachment close to the measuring point, line and surface of the test piece -- the double reticle connected together with the measuring head of the optical hole measuring device Aiming at the location of the measurement method. When measuring, the measuring head of the optical hole measuring device is pressed against the surface of the part (inner and outer). When measuring the hole diameter, firstly make the probe contact with the inner hole of the test piece, and after obtaining the maximum chord length, make the middle engraved line of the meter word line be set in the middle by the double set of lines of the optical hole measuring device, and read a number in the reading microscope ;Then change the measurement direction so that the measuring head is in contact with the test piece on the other side, and the middle reticle of the meter-shaped line reticle is still covered by the double set of lines of the optical hole measuring device in the middle, and read on the reading microscope Another number. The difference between the two readings, plus the actual value of the diameter of the probe, is the inner dimension of the test piece, and if the actual value of the diameter of the probe is subtracted, it is the outer dimension of the test piece.
